[#6758] Platform: Reuse on-premise instance once the instance got delete.

managed/src/main/java/com/yugabyte/yw/commissioner/tasks/UniverseTaskBase.java

@@ -316,6 +316,9 @@ public SubTaskGroup createDestroyServerTasks(Collection<NodeDetails> nodes,
       if (node.cloudInfo.private_ip == null) {
         LOG.warn(String.format("Node %s doesn't have a private IP. Skipping node delete.",
                                node.nodeName));
+        // Free up the node so that the client can use the instance to create another universe.
+        NodeInstance providerNode = NodeInstance.getByName(node.nodeName);
+        providerNode.clearNodeDetails();
         continue;
       }
       AnsibleDestroyServer.Params params = new AnsibleDestroyServer.Params();